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Thermal conductivity of some irons and steels over the temperature range 100 to 500 C

1934; Volume: 12; Issue: 4 Linguagem: Inglês

10.6028/jres.012.042

2376-9815

S.M. Shelton,

Metallurgical Processes and Thermodynamics

The thermal conductivities over the temperature range 100 to 500 C have been determined for 20 irons and steels which were selected as typical examples of commercial materials used for a variety of purposes and expected to have considerably different thermal conductivities.The data on the chromium-iron anc chromium-nickel-iron alloys are of particular interest because of the lack of previous data on the thermal conductivity of "stainless" steels.The apparatus was designed for comparative measurements and thus eliminated calorimetric or power-input determinations which are difficult to perform with uniformly high accuracy over a broad range of temperature.High-purity lead was used, either directly or indirectly, as the standard with which other metals were compared.The results indicate that, in general, the differences in conductivity of irons and steels are much smaller at high temperatures than at room temperatures.High-alloy steels have lower thermal conductivities than low-alloy steels.The thermal conductivities of irons and low-alloy steels decrease with increase in temperature.The conductivities of the high-alloy steels increase with increase in temperature; in other words, an increase in the amount of alloying constitu- ents in iron causes, in general, a decrease in thermal conductivity and an increase in the temperature coefficient.The many and sometimes conflicting factors concerned make it practically impossible to generalize on the quantitative rela- tionship of thermal conductivity and total alloy content of ferrous metals.A fairly complete bibliography of data on the thermal conductivity of iron and steel is given.